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Title: General rules prospected for the liquid fragility in various material groups and different thermodynamic conditions

The fragility parameter has been acknowledged as one of the most important characteristics of glass-forming liquids. We show that the mystery of the dramatic change in molecular dynamics of systems approaching the glass transition can be better understood by the high pressure study of fragility parameters defined in different thermodynamic conditions. We formulate and experimentally confirm a few rules obeyed by the fragility parameters, which are also rationalized by the density scaling law and its modification suggested for associated liquids. In this way, we successfully explore and gain a new insight into the pressure effect on molecular dynamics of van der Waals liquids, polymer melts, ionic liquids, and hydrogen-bonded systems near the glass transition.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice (Poland)
  2. (Poland)
  3. Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, D-01069 Dresden (Germany)
Publication Date:
OSTI Identifier:
22436617
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 141; Journal Issue: 13; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; DENSITY; HYDROGEN; LIQUIDS; MOLECULAR DYNAMICS METHOD; MOLTEN SALTS; POLYMERS; VAN DER WAALS FORCES